US7375464B2 - Full-color organic light emitting display having red, green, blue, cyan, magenta, and yellow color modulation layers - Google Patents
Full-color organic light emitting display having red, green, blue, cyan, magenta, and yellow color modulation layers Download PDFInfo
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/302—Details of OLEDs of OLED structures
- H10K2102/3023—Direction of light emission
- H10K2102/3031—Two-side emission, e.g. transparent OLEDs [TOLED]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K71/421—Thermal treatment, e.g. annealing in the presence of a solvent vapour using coherent electromagnetic radiation, e.g. laser annealing
Definitions
- the present invention relates to an organic light emitting display (OLED), and more particularly to an organic light emitting display having color modulation layers.
- an organic light emitting display includes a substrate, an anode located on the substrate, an emission layer (EML) located on the anode, and a cathode located on the emission layer.
- EML emission layer
- a cathode located on the emission layer.
- a method of forming emission layers corresponding to red, green, and blue is used to realize a full color of the organic light emitting display.
- the emission layers corresponding to red, green, and blue have different lifetime characteristics, it is difficult to maintain white balance when the display ages.
- an organic light emitting display that includes a substrate, a first electrode arranged on the substrate, a second electrode arranged on the first electrode, an organic functional layer arranged between the first electrode and the second electrode, the organic functional layer comprises at least an emission layer, and red, green, blue, cyan, magenta, and yellow color modulation layers separated from each other, wherein one of the first electrode and the second electrode is transparent and is arranged between each color modulation layer and the emission layer.
- the active matrix OLEDs employ thin film transistors.
- Each of these six OLEDs employ color modulation layers for each of red, green, blue, yellow, magenta and cyan.
- the color modulation layers can be simply color filter layers or color conversion layers stacked in top of color filter layers.
- the emission layer is designed to emit white light. When passing through the color filter layers, one of red, green, blue, yellow, magenta and cyan is produced. When passing through the color conversion layers, the reproducibility of each of these colors is enhanced.
- FIGS. 1 and 2 are plan views illustrating unit pixel arrangements of organic light emitting displays according to embodiments of the present invention
- FIG. 3 is a cross-sectional view of a passive matrix top emission OLED according to a first embodiment of the present invention
- FIG. 4 is a cross-sectional view of an active matrix top emission OLED according to a second embodiment of the present invention.
- FIG. 5 is a cross-sectional view of a passive matrix bottom emission OLED according to a third embodiment of the present invention.
- FIG. 6 is a cross-sectional view of an active matrix bottom emission OLED according to a fourth embodiment of the present invention.
- FIG. 7 is a cross-sectional view of a passive matrix dual emission OLED according to a fifth embodiment of the present invention.
- FIG. 8 is a cross-sectional view of a active matrix dual emission OLED according to a sixth embodiment of the present invention.
- FIG. 9 is a graph showing color reproducibility of an organic light emitting layer according to an embodiment of the present invention.
- FIGS. 1 and 2 are plan views illustrating pixel arrangements of organic light emitting displays according to embodiments of the present invention.
- FIG. 1 shows a stripe-type pixel arrangement
- FIG. 2 shows a delta-type pixel arrangement.
- red, green, and blue pixels R, G, and B are repeatedly arranged in a row, and yellow, magenta, and cyan pixels Y, M, and C are repeatedly arranged in another row.
- the red pixel R and the yellow pixel Y, the green pixel G and the magenta pixel M, and the blue pixel B and the cyan pixel C are located in the same column, respectively, and are repeatedly arranged.
- a first red pixel R 1 , a first green pixel G 1 , and a first cyan pixel C 1 are repeatedly arranged in a row, and a first yellow pixel Y 1 , a first magenta pixel M 1 , and a first blue pixel B 1 are repeatedly arranged in another row, which form a first group.
- a second red pixel R 2 , a second green pixel G 2 , and a second cyan pixel C 2 are repeatedly arranged in another row, and a second yellow pixel Y 2 , a second magenta pixel M 2 , and a second blue pixel B 2 are repeatedly arranged in still another row, which form a second group.
- the second group is shifted in the horizontal direction by 1.5 pitches from the first group. Therefore, the first red pixel R 1 , the first green pixel G 1 , and the second blue pixel B 2 form a triangle, and the first yellow pixel Y 1 , the first magenta pixel M 1 , and the second cyan pixel C 2 form another triangle.
- the first red pixel R 1 , the first green pixel G 1 , the second blue pixel B 2 , the first yellow pixel Y 1 , the first magenta pixel M 1 , and the second cyan pixel C 2 constitute a unit pixel P 2 as illustrated by the closed dotted line in FIG. 2 .
- the “first pixel” and the “second pixel”, for example, the first red pixel R 1 and the second red pixel R 2 are equal to each other, except that their relative locations in the pixel arrangement are different.
- FIG. 3 is a cross-sectional view illustrating an organic light emitting display and a fabrication method thereof according to a first embodiment of the present invention.
- the organic light emitting display of FIG. 3 is a top emission passive matrix type OLED having color modulation layers.
- a substrate 100 having red, green, blue, yellow, magenta, and cyan pixel areas (R, G, B, Y, M and C) is provided.
- the substrate 100 can be made of glass, plastic, or quartz.
- a reflective layer (not shown) can be formed on all the pixel areas of the substrate 100 . The reflective layer prevents light from entering the substrate 100 .
- First electrodes 550 separated from each other in each of R, G, B, Y, M, and C unit pixel areas are formed on the reflective layer.
- the first electrodes 550 are formed as reflective electrodes that reflect light.
- the first electrodes 550 can be formed as anodes or cathodes.
- the first electrodes 550 can have a structure obtained by sequentially stacking a reflective plate and an ITO (Indium Tin Oxide) layer or a structure obtained by sequentially stacking a reflective plate and an IZO (Indium Zinc Oxide) layer.
- the first electrodes 550 can instead have a mono-layered structure made of one of nickel (Ni), platinum (Pt), gold (Au), iridium (Ir), chrome (Cr) or an oxide thereof.
- the reflective plate can be an aluminum-neodymium (AlNd) layer.
- the first electrodes 550 are cathodes, the first electrodes 550 are formed using one of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), barium (Ba), and alloys thereof to have a thickness that is thick enough to reflect light.
- a pixel defining layer 570 having openings that expose a portion of the surface of each first electrodes 550 , is formed on the substrate 100 on which the first electrodes 550 are formed.
- the pixel defining layer 570 can be, for example, an acrylic organic layer.
- an organic functional layer 600 having at least an emission layer is formed on all the R, G, B, Y, M, and C pixel areas including on the exposed portions of first electrodes 550 .
- the organic functional layer 600 can further include a charge transport layer and/or a charge injection layer located on or under the emission layer.
- the emission layer can an emission layer that emits white light.
- the emission layer can have two or more sub emission layers emitting light components having colors. More specifically, one of the sub emission layers can be a sub emission layer emitting orange-red light and the other can be a sub emission layer emitting blue light. Accordingly, white light can be emitted using these two sub emission layers. It is desirable that the sub emission layer that emits orange-red light be phosphorescent and the sub emission layer that emits blue light be fluorescent. A phosphorescent sub emission layer that emits the light of an orange-red range has a higher emission efficiency than that of the fluorescent sub emission layer that emits orange-red light.
- a fluorescent sub emission layer that emits blue light has superior lifetime characteristics a phosphorescent sub emission layer that emits blue light. Therefore, the emission layer formed by stacking the phosphorescent sub emission layer that emits orange-red light and the fluorescent sub emission layer that emits blue light has both superior emission efficiency and superior lifetime characteristics.
- the emission layer can instead be formed out of a high-molecular material and/or a low-molecular material using a spin coating method or a vacuum deposition method.
- a second electrode 650 is formed on the organic functional layer 600 to cross the first electrodes 550 .
- the second electrode 650 is a transparent electrode and the light emitted from the emission layer is radiated through the second electrode 650 .
- the first electrodes 550 are anodes
- the second electrode 650 is a cathode
- the first electrodes 550 are cathodes
- the second electrode 650 is an anode.
- the second electrode can be made out of Mg, Ca, Al, Ag, Ba, or an alloy thereof and can be formed to have a thickness that is thin enough to allow light to transmit therethrough.
- the second electrode 650 is an anode, it is formed out of either ITO or IZO.
- the transparent passivation layer 670 can be made of an inorganic layer, an organic layer, or an organic-inorganic complex layer.
- the transparent passivation layer 670 is made of either ITO, IZO, SiO 2 , SiN x , Y 2 O 3 or Al 2 O 3 .
- the transparent passivation layer 670 is an organic layer, it is made out of either parylene or HDPE.
- the transparent passivation layer 670 is an organic-inorganic complex layer, it is a compound layer made out of Al 2 O 3 and an organic polymer.
- a red color modulation layer On top of the transparent passivation layer 670 is a red color modulation layer, a green color modulation layer, a blue color modulation layer, a yellow color modulation layer, a magenta color modulation layer, and a cyan color modulation layer for the R, G, B, Y, M and C pixels, respectively. These modulation layers are formed at locations that correspond to respective first electrodes 550 .
- the color modulation layers can be color filter layers 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C.
- the color filter layers can include a pigment and a polymer binder, and can be classified in red, green, blue, yellow, magenta, and cyan color filter layers, depending upon kinds of the pigment.
- the color filter layers can filter the white light emitted from the emission layer allowing only the respective colors to pass through. For example, the red color filter layer 710 R transmits the red component of the white light emitted from the emission layer while filtering out all the other colors.
- the color filter layers 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C are formed using a laser thermal transfer imaging (LITI) method.
- LITI laser thermal transfer imaging
- the formation of the color filter layers using the LITI method will now described in detail.
- red, green, blue, yellow, magenta, and cyan donor films for forming the color filter layers are prepared.
- the preparation of the donor films are performed by forming a light-to-heat conversion layer on a base film and then forming a transfer layer for a color filter layer corresponding to each color on the light-to-heat conversion layer.
- one of the donor films for example, the red donor film is positioned on the substrate 100 having the transparent passivation layer 670 , such that the transfer layer for a color filter layer faces the substrate 100 .
- laser beams are irradiated onto the base film, thus transferring the transfer layer for the red color filter layer 710 R onto the transparent passivation layer 670 .
- the red color filter layer 710 R corresponding to a corresponding first electrode 550 is formed on the transparent passivation layer 670 in the red pixel area R.
- the green color filter layer 710 G, the blue color filter layer 710 B, the yellow color filter layer 710 Y, the magenta color filter layer 710 M, and the cyan color filter layer 710 C are formed on the transparent passivation layer 670 in their G, B, Y, M and C pixel regions respectively. Accordingly, the fabrication time can be reduced compared with when the color filter layers are formed using a photolithography method in which exposure and development are repeatedly performed. Also, the resolution can be enhanced compared with when the color filter layers are formed using a vacuum deposition method.
- the color modulation layers can instead have a stacked structure of the color filter layers 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C and color conversion layers 700 R, 700 G, 700 B, 700 Y, 700 M, and 700 C positioned under the color filter layers 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C, respectively.
- the red color conversion layer 700 R, the green color conversion layer 700 G, the blue color conversion layer 700 B, the yellow color conversion layer 700 Y, the magenta color conversion layer 700 M, and the cyan color conversion layer 700 C are formed on the transparent passivation layer 670 using the LITI method to correspond to the respective first electrodes 550 . Accordingly, it is possible to form color modulation layer patterns in which the color conversion layers 700 R, 700 G, 700 B, 700 Y, 700 M, and 700 C and the color filter layers 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C are sequentially stacked. It is preferable that the respective color modulation layer patterns are formed at once using the LITI method.
- the color conversion layer can include a fluorescent material and a polymer binder.
- the fluorescent material emits light having a wavelength greater than that of light entered from the emission layer and the fluorescent material is excited by the entered light as electrons return to a ground state.
- the color conversion layers can be classified into red, green, blue, yellow, magenta, and cyan color conversion layers, depending upon kinds of the fluorescent material.
- each color modulation layer has the stacked structure of the color conversion layer and the color filter layer
- the white light emitted from the emission layer is converted to a red light beam upon passing through the red color conversion layer 700 R, and the converted red light beam is filtered into a red light beam having high purity upon passing through the red color filter layer 710 R. Therefore, when the color modulation layer has the stacked structure of the color conversion layer and the color filter layer, it is possible to obtain colors having high color purity.
- an over-coating layer 800 is formed on the color modulation layers.
- the over-coating layer 800 is a transparent layer that protects the color modulation layers from physical damage.
- the light emitted from the emission layer is radiated through a transparent electrode, i.e. the second electrode 650 , and through the color modulation layers, the color modulation layers being located on an opposite side of the second electrode 650 than the emission layer.
- a transparent electrode i.e. the second electrode 650
- the color modulation layers being located on an opposite side of the second electrode 650 than the emission layer.
- FIG. 4 is a cross-sectional view illustrating an organic light emitting display and a fabrication method thereof according to a second embodiment of the present invention.
- the organic light emitting display of FIG. 4 is of a top-emission active matrix type OLED having color modulation layers.
- a buffer layer 150 is formed on the substrate 100 having red, green, blue, yellow, magenta, and cyan pixel areas (R, G, B, Y, M, and C).
- the buffer layer 150 protects thin film transistors that are later formed in a subsequent process from impurities migrating from the substrate 100 .
- An active layer 250 having a source region 210 , a drain region 230 , and a channel region 220 is formed on the buffer layer 150 of the respective R, G, B, Y, M, and C pixel areas.
- a gate insulating layer 300 is formed on the active layer 250 .
- a gate electrode 350 is formed on the gate insulating layer 300 and overlaps the channel region 220 .
- a first insulating interlayer 400 is formed to cover the gate electrodes 350 .
- Source electrode 410 and drain electrode 430 are formed on the first insulating interlayer 400 and are electrically connected to the source region 210 and the drain region 230 , respectively.
- the active layer 250 , the source electrode 410 , the drain electrode 430 , and the gate electrode 350 make up a thin film transistor.
- Thin film transistors are located on the respective R, G, B, Y, M, and C pixel areas.
- a second insulating interlayer 500 is formed to cover the thin film transistors, and a via hole 510 that exposes the drain electrode 430 is formed in the second insulating interlayer 500 .
- the second insulating interlayer 500 can be a layer of inorganic material, an layer of organic material, or a composite of organic and inorganic materials.
- the inorganic material is preferably silicon nitride which can passivate the underlying active layer 250 with hydrogen as well as prevent infiltration of moisture and oxygen.
- the organic material is preferably BCB (BenzoCycloButene) or acrylic organic material which can cover step differences caused by the underlying patterns.
- First electrodes 550 are separated from each other in a unit of pixel areas R, G, B, Y, M, and C and are formed on the substrate 100 in which the via holes 510 are formed. As a result, the first electrodes 550 are electrically connected to the drain electrodes 430 of each of the thin film transistors, via via holes 510 , respectively.
- a pixel defining layer 570 , an organic functional layer 600 having at least an emission layer, a second electrode 650 , a transparent passivation layer 670 , color modulation layers, and an over-coating layer 800 are formed on the first electrodes 550 .
- the color modulation layers can have a mono-layered structure of a color filter layer, or can have a stacked structure in which a color conversion layer and a color filter layer are sequentially stacked. Since the first electrodes 550 , the pixel defining layer 570 , the organic functional layer 600 , the second electrode 650 , the transparent passivation layer 670 , the color modulation layers, and the over-coating layer 800 have already been described in conjunction with FIG. 3 , the descriptions thereof will be omitted.
- FIG. 5 is a cross-sectional view illustrating an organic light emitting display and a fabrication method thereof according to a third embodiment of the present invention.
- the organic light emitting display of FIG. 5 is of a bottom-emission passive matrix type OLED having color modulation layers.
- a substrate 101 having red, green, blue, yellow, magenta, and cyan pixel areas R, G, B, Y, M, and C is prepared.
- the substrate 101 is a transparent substrate and can be made of glass, plastic, or quartz.
- a black matrix pattern 110 can be formed on the substrate 101 .
- the black matrix pattern 110 can be made of a chrome oxide (CrO x ) layer, a molybdenum oxide (MoO x ) layer, or an MIHL (Metal Insulator Hybrid Layer).
- Color modulation layers are separated from each other in unit of pixel areas R, G, B, Y, M, and C and are formed on the substrate 101 .
- the color modulation layers can be color filter layers, that is, a red color filter layer 530 R, a green color filter layer 530 G, a blue color filter layer 530 B, a yellow color filter layer 530 Y, a magenta color filter layer 530 M, and a cyan color filter layer 530 C.
- the color modulation layers can further include a red color conversion layer 540 R, a green color conversion layer 540 G, a blue color conversion layer 540 B, a yellow color conversion layer 540 Y, a magenta color conversion layer 540 M, and a cyan color conversion layer 540 C stacked on the respective color filter layers and formed in the R, G, B, Y, M and C pixel areas respectively. Since the color modulation layers and the method of forming the color modulation layers have been already described in detail in conjunction with FIG. 3 , descriptions thereof will be omitted.
- an over-coating layer 545 is formed on the substrate 101 on which the color modulation layers are formed.
- the over-coating layer 545 is a transparent layer and coats step differences generated due to the formation of the color modulation layers as well as protects the color modulation layers from physical damage.
- first electrodes 560 are formed on the over-coating layer 545 to correspond to the color modulation layers, respectively.
- the first electrodes 560 are transparent electrodes, and thus the light emitted from an emission layer to be formed in a subsequent process is radiated through the first electrodes 560 .
- the first electrodes 560 can be formed as an anode or a cathode.
- the first electrodes 560 are made out of Mg, Ca, Al, Ag, Ba, or alloys thereof to have a small enough thickness to allow light to pass through.
- the first electrodes 560 are anodes, the first electrodes 560 are made out of ITO or IZO.
- a pixel defining layer 570 and an organic functional layer 600 having at least an emission layer are formed on the substrate 101 on which the first electrodes 560 are formed. Since the pixel defining layer 570 and the organic functional layer 600 have already been described in detail with reference to FIG. 3 , descriptions thereof will be omitted.
- a second electrode 660 is formed on the organic functional layer 600 to cross the first electrodes 560 .
- the second electrode 660 is formed as a reflective electrode that reflects light.
- the second electrode 660 is formed as a cathode when the first electrode 560 is an anode, and the second electrode 660 is formed as an anode when the first electrode 560 is a cathode.
- the second electrode 660 can have a structure in which an ITO layer and a reflective plate are sequentially stacked.
- the second electrode 660 when the second electrode 660 is an anode, the second electrode 660 can have a structure in which an IZO layer and a reflective plate are sequentially stacked.
- the second electrode 660 can instead be a mono-layered structure made out of one of Ni, Pt, Au, Ir, Cr or an oxide thereof.
- the reflective plate can be an AlNd layer.
- the light emitted from the emission layer passes through the first electrodes 560 , (i.e. transparent electrodes) and also through the color modulation layers, and then is radiated toward the substrate 101 .
- the color modulation layers are located on the opposite side of the first electrodes 560 than the emission layers.
- FIG. 6 is a cross-sectional view illustrating an organic light emitting display and a fabrication method thereof according to a fourth embodiment of the present invention.
- the organic light emitting display of FIG. 6 is of a bottom-emission active matrix type OLED display having color modulation layers.
- a substrate 101 having red, green, blue, yellow, magenta, and cyan pixel areas (R, G, B, Y, M, and C) is prepared.
- the substrate 101 is a transparent substrate and can be made of glass, plastic, or quartz.
- a buffer layer 150 substantially equal to that described in the embodiment of FIG. 4 an active layer 250 having a source region 210 , a drain region 230 , and a channel region 220 , a gate insulating layer 300 , a gate electrode 350 , a first insulating interlayer 400 , a source electrode 410 , a drain electrode 430 , and a second insulating interlayer 500 are formed on the substrate 101 .
- the active layer 250 , the source electrode 410 , the drain electrode 430 , and the gate electrode 350 make up a thin film transistor.
- a thin film transistor is positioned in each of the R, G, B, Y, M, and C pixel areas.
- the areas in which the thin film transistors are formed are light-shielding areas blocking the light emitted from an emission layer that is later formed in a subsequent process. Areas outside the light-shielding areas are light-transmitting areas allowing light emitted from an emission layer to transmit therethrough.
- color modulation layers separated from each other in R, G, B, Y, M, and C unit of pixel areas and the second insulating interlayer 500 in the light-transmitting areas are formed.
- the color modulation layers can have a mono-layered structure of color filter layers 530 R, 530 G, 530 B, 530 Y, 530 M, and 530 C, or can have a stacked structure having the color filter layers and a color conversion layers 540 R, 540 G, 540 B, 540 Y, 540 M, and 540 C stacked on the color filter layers.
- an over-coating layer 545 is formed over the color modulation layers. Since the color modulation layers and the over-coating layer 545 have already been described in detail in conjunction with FIG. 5 , descriptions thereof will be omitted.
- the color modulation layers can instead be formed between the first insulating interlayer 400 and the second insulating interlayer 500 in the light-transmitting areas.
- Another alternative design is to have the color modulation layers positioned between the gate insulating layer 300 and the first insulating interlayer 400 in the light-transmitting areas.
- Still another alternative design is to have the color modulation layers positioned between the buffer layer 150 and the gate insulating layer 300 in the light-transmitting areas.
- Yet another alternative design is to have the color modulation layers positioned between the substrate 101 and the buffer layer 150 in the light-transmitting areas.
- a via hole 510 that exposes the drain electrode 430 is formed in the over-coating layer 545 and in the second insulating interlayer 500 .
- First electrodes 560 which are separated from each other in the R, G, B, Y, M, and C unit of pixel areas and which correspond to the color modulation layers, respectively, are formed on the substrate 101 in which the via holes are formed 510 . Accordingly, the first electrodes 560 are electrically connected to the drain electrodes 430 of the thin film transistors through the via holes 510 .
- a pixel defining layer 570 an organic functional layer 600 having at least an emission layer, and a second electrode 660 are formed on the first electrodes 560 . Since the first electrodes 560 , the pixel defining layer 570 , the organic functional layer 600 having at least an emission layer, and the second electrode 660 have already been described in detail in conjunction with FIG. 5 , descriptions thereof will be omitted.
- FIG. 7 is a cross-sectional view illustrating an organic light emitting display and a fabrication method thereof according to a fifth embodiment of the present invention.
- the organic light emitting display of FIG. 7 is a dual emission passive matrix type OLED having color modulation layer. Dual emission is both bottom emission and top emission.
- a substrate 101 having red, green, blue, yellow, magenta, and cyan pixel areas (R, G, B, Y, M, and C) is prepared.
- a black matrix pattern 110 exposing parts of the respective R, G, B, Y, M, and C pixel areas can be formed on the substrate 101 .
- First color modulation layers separated from each other in a unit of pixel areas R, G, B, Y, M, and C are formed on the exposed areas.
- the first color modulation layers can be a mono-layered structure of a first color filter layers 530 R, 530 G, 530 B, 530 Y, 530 M, and 530 C, or be a stacked structure having the first color filter layers and a first color conversion layers 540 R, 540 G, 540 B, 540 Y, 540 M, and 540 C stacked on the first color filter layers. It is preferable that an over-coating layer 545 is formed on the substrate on which the first color modulation layers are formed.
- First electrodes 560 corresponding to the respective first color modulation layers are formed on the over-coating layer 545 .
- a pixel defining layer 570 and an organic functional layer 600 having at least an emission layer are formed on the substrate 101 on which the first electrodes 560 are formed. Since the substrate 101 , the black matrix pattern 110 , the first color modulation layers, the over-coating layer 545 , the first electrodes 560 , the pixel defining layer 570 , and the organic functional layer 600 have already been described in conjunction with FIG. 5 , descriptions thereof will be omitted.
- a second electrode 650 substantially equal to that in FIG. 3 , a transparent passivation layer 670 , second color modulation layers, and an over-coating layer 800 are formed on the organic functional layer 600 .
- the second color modulation layers can have a mono-layered structure of 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C color filter layers, or a stacked structure in which a second color conversion layers 700 R, 700 G, 700 B, 700 Y, 700 M, and 700 C and the second color filter layers are sequentially stacked.
- the light emitted from the emission layer is radiated toward the substrate 101 through the transparent first electrodes 560 and through the first color modulation layers, wherein the first color modulation layers are located on the opposite side of the first electrodes 560 from the emission layer. And also the light emitted from the emission layer is radiated through the transparent second electrode 650 and through the second color modulation layers, wherein the second color modulation layers are located on an opposite side of the second electrode 650 than the emission layer.
- FIG. 8 is a cross-sectional view illustrating an organic light emitting display and a fabrication method thereof according to a sixth embodiment of the present invention.
- the organic light emitting display of FIG. 8 is a dual-emission active matrix type OLED having color modulation layers.
- a substrate 101 having red, green, blue, yellow, magenta, and cyan pixel areas R, G, B, Y, M, and C is prepared.
- the substrate 101 is a transparent substrate and can be made of glass, plastic, or quartz.
- the first color modulation layers can be a mono-layered structure of a first color filter layer 530 R, 530 G, 530 B, 530 Y, 530 M, and 530 C, or can be a stacked structure having first color filter layers and first color conversion layers 540 R, 540 G, 540 B, 540 Y, 540 M, and 540 C stacked on the first color filter layers.
- the second color modulation layers can have a mono-layered structure of second color filter layers 710 R, 710 G, 710 B, 710 Y, 710 M, and 710 C, or can have a stacked structure in which a second color conversion layers 700 R, 700 G, 700 B, 700 Y, 700 M, and 700 C and the second color filter layers are sequentially stacked.
- FIG. 9 is a graph illustrating color reproducibility of the organic light emitting displays according to an embodiment of the present invention.
- transmitted light beams are generated by allowing white light emitted from the emission layer to pass through the red, green, blue, yellow, magenta, and cyan color modulation layers and the colors R, G, B, Y, M, and C of the transmitted light beams are converted into color coordinates as illustrated in FIG. 9 .
- the color coordinates corresponding to the R, G, B, Y, M, and C colors are all linked, the result is the area on the graph illustrated in FIG. 9 .
- FIG. 9 In FIG.
- the organic light emitting displays according to the present invention can independently realize yellow Y, magenta M, and cyan C, in addition to red R, green G, and blue B, so that it is possible to realize natural colors having a wider range. In other words, the organic light emitting displays according to the present invention have excellent color reproducibility.
- the present invention it is possible to maintain white balance after an OLED ages and is used a lot by forming an emission layer to emit white.
- by forming the color modulation layers using the LITI method it is possible to reduce the fabrication time while realizing high resolution.
Abstract
Description
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US20180061905A1 (en) * | 2016-08-31 | 2018-03-01 | Lg Display Co., Ltd. | Organic light-emitting display device and method of manufacturing the same |
US10204966B2 (en) * | 2016-08-31 | 2019-02-12 | Lg Display Co., Ltd. | Organic light-emitting display device and method of manufacturing the same |
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US20060082295A1 (en) | 2006-04-20 |
KR100685407B1 (en) | 2007-02-22 |
KR20060034162A (en) | 2006-04-21 |
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